Inventor and businessman. Correspondence, diary,
financial and business papers, patents by Hollerith and others,
blueprints, drawings, a Hollerith machine punch plate, writings about Hollerith
by Geoffrey Austrian and others, biographical material, and other papers
relating to Hollerith tabulating machines and their use in census taking
(1890-1910), operation of Tabulating Machine Company and its merger with two
other companies forming Computer-Tabulating-Recording Company (1911), and
Hollerith's association with this company and its successor, International
Business Machines Corporation.